By design, so it won't look like you are riding your brake lights. The switch and mounting positions are all in place in my 87, but no bulb, contacts, or wiring. The one on my 98 works, so I guess DOT decided to allow them by 98. Funny people, DOT: My 87 Euro headlights are supposedly not legal, but the low beam cut off pattern is identical to the headlights on my US legal 98!!!
2003 Firemist Red/grey leather SL 500
2015 Palladium Silver/black mbtex GLK 350
1987 Smoke Silver/burgundy mbtex 300E Sportline (SOLD)
Click to see 87 300E